title: Pig oocytes with a large perivitelline space matured in vitro show greater developmental competence after parthenogenesis and somatic cell nuclear transfer.
abstract: The objective of this study was to examine the developmental competence of pig oocytes in relation to the size of the perivitelline space (PVS) of oocytes matured in vitro. Immature oocytes were matured in medium 199 or porcine zygote medium (PZM)-3 containing 108 or 61.6 mM NaCl. In vitro-matured (IVM) oocytes were examined for intracellular glutathione (GSH) level; cyclin-dependent kinase 1 (CDK1), proliferating cell nuclear antigen (PCNA), and extracellular signal-regulated kinase 2 (ERK2) mRNA levels; and developmental competence after parthenogenesis (PA) and somatic cell nuclear transfer (SCNT). IVM oocytes with a larger PVS had higher (P < 0.05) levels of intracellular GSH (1.00 pixels/oocyte vs. 0.57 pixels/oocyte) and blastocyst formation (54.3% vs. 37.3%) after PA than oocytes with a smaller PVS. Culturing oocytes for maturation in PZM-3 with reduced (61.6 mM) NaCl increased (P < 0.05) the size of the PVS (6.4 µm vs. 2.8 µm) compared to control oocytes that were matured in normal PZM-3 containing 108 mM NaCl. Moreover, oocytes with a larger PVS showed higher CDK1, PCNA, and ERK2 mRNA and intracellular GSH levels (1.6 pixels/oocyte vs. 1.2 pixels/oocyte) and increased blastocyst formation after PA (52.1% vs. 40.6%) and SCNT (31.8% vs. 18.2%) than control oocytes. Our results demonstrate that pig oocytes with a large PVS have greater developmental competence after PA and SCNT, which is attributed to improved cytoplasmic maturation based on the enhanced GSH level and transcription factor expression. Further, enlargement of the PVS by culturing in low-NaCl medium improves the developmental competence of pig oocytes.
authors.affiliation: College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea.
authors.forename: Joohyeong
authors.initials: J
authors.lastname: Lee
authors.forename: Jinyoung
authors.initials: J
authors.lastname: You
authors.forename: Geun-Shik
authors.initials: GS
authors.lastname: Lee
authors.forename: Sang-Hwan
authors.initials: SH
authors.lastname: Hyun
authors.forename: Eunsong
authors.initials: E
authors.lastname: Lee
mesh_terms: D000818:Animals; D016203:CDC2 Protein Kinase / Q000378:metabolism; D018929:Cell Culture Techniques; D003470:Culture Media / Q000737:chemistry; D005978:Glutathione / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D053652:Nuclear Transfer Techniques; D009865:Oocytes / Q000166:cytology* / Q000502:physiology; D010312:Parthenogenesis / Q000502:physiology*; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D013552:Swine / Q000196:embryology*; D014817:Vitelline Membrane / Q000502:physiology*; D015044:Zona Pellucida / Q000502:physiology*
chemical_list: D003470:Culture Media; D018809:Proliferating Cell Nuclear Antigen; D016203:CDC2 Protein Kinase; D019950:Mitogen-Activated Protein Kinase 1; D005978:Glutathione